1561926 has 16 divisors (see below), whose sum is σ = 3307824. Its totient is φ = 489984.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561926 is 6291651.

It is a super-2 number, since 2×1561926² = 4879225658952, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1561893 and 1561902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7555 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (206739).

2^1561926 is an apocalyptic number.

1561926 is an abundant number, since it is smaller than the sum of its proper divisors (1745898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561926 is a wasteful number, since it uses less digits than its factorization.

1561926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15335.

The product of its digits is 3240, while the sum is 30.

The square root of 1561926 is about 1249.7703789097. The cubic root of 1561926 is about 116.0255096494.

The spelling of 1561926 in words is "one million, five hundred sixty-one thousand, nine hundred twenty-six".